|
Issues | Warranty | Recalls / TSB Problems, issues, recalls, TSBs |
|
Thread Tools | Search this Thread |
08-06-2020, 10:12 PM | #1 |
Member
Join Date: Jul 2018
Drives: Scion FRS
Location: 80922
Posts: 19
Thanks: 9
Thanked 5 Times in 4 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Missing: BOOST - if found please post here -
I have found an interesting / complex problem with my turbo frs.
The set up: 10.5 to 1 iag block with precision 5558 turbo as well as an external waste gate by precision. Tuned by delicious The problem: Not boosting past a certain threshold The specifics: 91 will not go past 3 psi. E85 with not go past 6 psi (at 1 time it would go up to 7 or 8 but that doesn't happen anymore) I have a boost controller but I have bypassed it by running the vacuum tube from the turbo to the top of the waste gate. Here I get the same psi as I do when everything is hooked up correctly.3 psi on 91 and 6 psi on e85. My waste gate spring is 6 pounds. Here's the interesting part. When the vacuum tube is routed into the boost controller / waste gate correctly BUT the vacuum tube has been removed from the turbo the car boosts just fine. I have seen it go up to 16 psi on e85. What I have done: I have replaced the boost controller as well as the ECU. My tuner is 100% sure that it has nothing to do with the tune. My mechanic says it's not a vacuum leak. Things you should know: The last thing I did to the car before all of this happened was that I replaced the auto transmission with a manual. That means both front chassis wire and the dash wire harness were replaced. So was the ECU and the abs module. The vacuum tube from the brake booster was routed into the intake manifold as that's how I saw it done on a stock version of our cars. The question: why does the car boost just fine with the vacuum tube disconnected from the turbo but poorly when everything is routed correctly? Any ideas on what to check next? |
08-10-2020, 05:44 PM | #2 |
Senior Member
Join Date: Apr 2013
Drives: 2013 FR-S, Hot Lava; 2012 Z1000 CBO
Location: Minnesota, USA
Posts: 539
Thanks: 1,650
Thanked 253 Times in 165 Posts
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
|
This probably belongs in the Forced Induction section.
__________________
|
08-10-2020, 06:47 PM | #3 |
Senior Member
Join Date: Nov 2018
Drives: brz
Location: nc
Posts: 318
Thanks: 431
Thanked 739 Times in 443 Posts
Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
|
I found it! but it escaped out the blow off valve!
|
08-10-2020, 06:55 PM | #4 |
Senior Member
Join Date: Jun 2017
Drives: BRZ Yellow, 2019 Ranger, 2011 Evora
Location: Dallas
Posts: 1,682
Thanks: 352
Thanked 1,473 Times in 770 Posts
Mentioned: 14 Post(s)
Tagged: 1 Thread(s)
|
The line you speak of is pressure to diaphragm to push the waste gate open. I would replace your waste gate actuator next. I would also re-verify you lines are “routed correct”.
|
The Following User Says Thank You to Grady For This Useful Post: | Savoelh (08-10-2020) |
08-10-2020, 09:26 PM | #5 |
Member
Join Date: Jul 2018
Drives: Scion FRS
Location: 80922
Posts: 19
Thanks: 9
Thanked 5 Times in 4 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
|
08-10-2020, 10:13 PM | #7 |
Senior Member
Join Date: Nov 2018
Drives: brz
Location: nc
Posts: 318
Thanks: 431
Thanked 739 Times in 443 Posts
Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
|
How many ports does the boost controler have? How many lines are going to your waste gate? Did you change exhaust? Did you take waste gate off while changing transmission?
|
The Following User Says Thank You to solidsnake11 For This Useful Post: | Savoelh (08-14-2020) |
08-14-2020, 08:19 AM | #8 |
Senior Member
Join Date: Dec 2013
Drives: WRB BRZ
Location: New Jersey
Posts: 261
Thanks: 83
Thanked 150 Times in 96 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
Can you share a picture of how your vacuum lines are routed into your boost controller? Is it a standalone boost controller or a boost control solenoid plugged into your EVAP connection?
|
The Following User Says Thank You to Fred E For This Useful Post: | Savoelh (08-14-2020) |
08-14-2020, 09:28 PM | #9 |
Member
Join Date: Jul 2018
Drives: Scion FRS
Location: 80922
Posts: 19
Thanks: 9
Thanked 5 Times in 4 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Hey guys thanks for the input. It's a 3 port boost controller. One port is atmosphere. 1 goes to the cold side of the turbo and the 1 goes to the top of the waste gate.
I have been told that the map sensor seems to be malfunctioning by my tuner so that's the direction I'm headed. It doesn't make sense to me but thats the only direction I have atm. I'll post again once it's been installed. |
08-17-2020, 10:49 PM | #10 |
Member
Join Date: Jul 2018
Drives: Scion FRS
Location: 80922
Posts: 19
Thanks: 9
Thanked 5 Times in 4 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
The map sensor was reading low pressure. Problem resolved.
|
The Following 2 Users Say Thank You to Savoelh For This Useful Post: | solidsnake11 (08-18-2020), Wally86 (08-18-2020) |
|
|
Thread Tools | Search this Thread |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
alright my tenth post so i can officaly post in the marketplace | destiny86 | Scion FR-S / Toyota 86 GT86 General Forum | 4 | 02-04-2016 12:49 PM |
Digital boost gauge w/ vent pod grim speed boost controller | Meetjoeblack | Engine, Exhaust, Bolt-Ons | 0 | 03-09-2015 01:27 PM |
Greddy informeter, boost sensor, boost sensor harness, info touch sensor apaptor | Supra2k | Audio/Visual, Electronics, Infotainment, NAV | 1 | 02-26-2014 08:11 PM |
Anyone w/ 3.727/3.909 Final Drive Post Boost? | Staf00 | Engine, Exhaust, Transmission | 12 | 05-02-2013 08:38 PM |